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BUG: disallow scalar in CategoricalIndex construtor #38614

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Merged
merged 4 commits into from
Dec 23, 2020
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BUG: disallow scalar in CategoricalIndex construtor #38614

merged 4 commits into from
Dec 23, 2020

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jbrockmendel
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@jbrockmendel jbrockmendel commented Dec 21, 2020 •
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  • closes #xxxx
  • tests added / passed
  • passes black pandas
  • passes git diff upstream/master -u -- "*.py" | flake8 --diff
  • whatsnew entry

@jreback jreback mentioned this pull request Dec 22, 2020
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@jreback jreback added the Categorical Categorical Data Type label Dec 22, 2020
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jreback commented Dec 22, 2020

i guess need to deprecate here as well (unless you use the Categorical for constrution)

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i guess need to deprecate here as well

i think this is pretty unambiguously a bug

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jreback commented Dec 22, 2020

i guess need to deprecate here as well

i think this is pretty unambiguously a bug

oh right yeah its a scalar in an Index, ok

@jreback jreback added this to the 1.3 milestone Dec 22, 2020
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jreback commented Dec 22, 2020

ok i guess add a whatsnew here to document

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whatsnew added + greenish

@jreback jreback merged commit 019d053 into pandas-dev:master Dec 23, 2020
@jbrockmendel jbrockmendel deleted the bug-ci-scalar branch December 23, 2020 16:01
jorisvandenbossche
jorisvandenbossche reviewed Jan 4, 2021
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pandas/core/indexes/category.py
# if data is None, then categories must be provided
if data is not None or categories is None:
raise cls._scalar_data_error(data)
data = []
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This is not actually about passing scalar data, but about passing no data (eg pd.CategoricalIndex(categories=['a', 'b'])). We generally support constructors with passing no data to create an empty (eg Series also allows this).

So I would either keep supporting this, or either it should at least be deprecated (this eg breaks dask)

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Opened #38944 to track this

@jorisvandenbossche jorisvandenbossche mentioned this pull request Jan 4, 2021
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luckyvs1 pushed a commit to luckyvs1/pandas that referenced this pull request Jan 20, 2021
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BUG: disallow scalar in CategoricalIndex construtor (pandas-dev#38614)
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@simonjayhawkins simonjayhawkins mentioned this pull request May 22, 2021
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@ggold7046 ggold7046 mentioned this pull request Aug 10, 2023
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